JPS6320357B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic musical instrument, and more particularly to an electronic musical instrument that generates a musical tone in which musical tone elements such as pitch change randomly each time a key is pressed.

BACKGROUND ART Conventionally, some electronic musical instruments have been designed to generate a musical tone with randomly different musical tone elements such as pitch each time a key is pressed, or for each key when a plurality of keys are pressed, thereby realizing a special performance effect. In addition,
In this specification, such an effect in which the pitch changes randomly will be referred to as a key-on random pitch effect.

Such a key-on random pitch effect is realized by utilizing the fact that the channel to which the key assigner assigns the sound of the musical tone corresponding to the pressed key changes randomly in accordance with the key pressing timing.

In other words, the key assigner determines whether (a) there is a blank sounding channel to which no sounding has been assigned yet, and (b) which sounding channel is producing the musical sound corresponding to the pressed key. The system assigns the sound of the musical tone corresponding to the pressed key to a blank sound channel among the plurality of sound sound channels, subject to the following conditions: . In addition, in this allocation process, if there are a plurality of blank channels, the allocation process is executed in order from the oldest channel that has been released (the assigned key has been released). Therefore, depending on the key press timing, the channel to which the tone corresponding to the pressed key is assigned changes randomly. Therefore, when forming a musical tone signal based on the key information representing the pressed key in each sound channel, if a different pitch control parameter is given to each sound channel, the musical sound formed for each sound channel will be The pitch of the signal is controlled in different states, and the channel to which the sound is assigned changes each time the key is pressed, even for the same key, so the musical tone is formed using different parameters each time the key is pressed, producing the key-on random pitch effect described above. realizable.

However, if you have multiple series of musical tone generators and want to obtain different key-on random pitch effects for each series, the tone assignment by the key assigner is common to each series, so the above-mentioned parameters for each sound generation channel need to be set separately for each channel. In addition, this has to be changed for each series, making it impossible to standardize musical tone generators and making adjustment work troublesome.

This invention was made in view of the above-mentioned drawbacks of the conventional art.The purpose of this invention is to simplify the adjustment work, and also to make it possible to realize different key-on random pitch effects for each series using a common (same configuration) musical tone generator. Our goal is to provide electronic musical instruments that are unique to our customers.

To this end, the present invention provides each musical tone generating device with a parameter generating circuit of the same configuration capable of generating the same number of musical tone control parameters as the number of tone generating channels, and also provides parameters from each parameter generating circuit for each generating channel. The parameters are generated sequentially in synchronization with the channel time of the sound generation and applied to each sound generation channel, and the generation of the parameters is shifted by a predetermined number (at different phases) for each tone generation device.

Hereinafter, this invention will be explained in detail using the drawings.

FIG. 1 is a block diagram showing an embodiment of an electronic musical instrument according to the present invention, in which three systems of musical tone generators 30A, 30B, and 30C are provided, and each of the musical tone generators 30A to 30C has a maximum simultaneous polyphony. 16, and correspondingly 16 time-division sound channels ch1 to ch16 are provided.

Note that these musical tone generating devices 30A to 30C have the same configuration, and in the figure, device 30B
Only the detailed configuration is shown.

In FIG. 1, a key switch circuit 10 has a plurality of key switches corresponding to keys that operate when keys on a keyboard section are pressed, and the operation of each key switch is detected by a key assigner 20.

The key assigner 20 detects the ON or OFF operation of the key switch corresponding to each key in the key switch circuit 10, and generates the musical tone corresponding to the pressed key in accordance with the conditions (a) and (b) described above. Assign to one of the pronunciation channels ch1 to ch16.
In this case, the sound generation channels ch1 to ch16 in each of the musical tone generators 30A to 30C are defined by one period of the clock pulse φ, and the channel time ch·t1 of each sound generation channel ch1 to ch16 is defined by one period of the clock pulse φ.
-ch.t16 are repeated in sequence as shown in FIG. 2a, and if one period of the clock pulse φ is, for example, 1 μs, they are repeated every 16 μs, and each series is completely synchronized with each other. Therefore, the musical tone corresponding to one pressed key is assigned to a sound generation channel (any one of ch1 to ch16) common to the three series.

The key assigner 20 assigns the key code KC representing the pressed key assigned to each sound channel ch1 to ch16 in conjunction with the sound generation assignment of the musical tone corresponding to the pressed key.
Time-division output in synchronization with ch/t16. In addition, the key assigner 20 sends a key-on signal KON indicating whether or not the key assigned to each sound channel ch1 to ch16 is currently pressed at each channel time ch.t1 to ch16.
Time-division output in synchronization with ch/t16.

Furthermore, key assigner 20 is channel time
Synchronous signal at channel time ch t1 corresponding to channel ch 1 among ch t1 to ch t16
Output SYNC repeatedly. These key codes
KC and key-on signal KON are commonly supplied to three systems of musical tone generators 30A to 30C. Also,
The synchronization signal SYNC is the first series musical tone signal generator 3.
Supplied to 0A.

The musical tone generators 30A to 30C are composed of a frequency number memory 300, a detune memory 301, a shift register 302, an adder 303, an accumulator 304, and a tone generator 305, as shown in the detailed configuration representing the device 30B. It is configured.

The frequency number memory 300 stores a frequency number F (numerical information) corresponding to the pitch of each key at each address.
When a key code KC indicating the key to be pressed assigned to each sound channel ch1 to ch16 is input from the key assigner 20 as an address signal in time division, the frequency number F corresponding to this key code KC is stored in time. It is divided and output and supplied to an adder 303.

The detune memory 301 has 16 memory addresses A1 to A16 equal to the number of sound generation channels,
Each of these addresses A1 to A16 contains a frequency correction number (numerical information) that has a different value for each address in order to slightly shift the pitch of the musical tone from the normal pitch.
Fd is stored, and the input signal and output signal of the shift register 302 are added as address signals.

That is, the shift register 302 consists of 15 stages and 1 bit, and is shift-controlled by clock pulse φ in synchronization with each channel time, and the input signal of this shift register 302 and the output signals of the first to fifth stages are controlled by the clock pulse φ. are respectively supplied to each addressing input (A1 to A16) of detune memory 301. Therefore, when a "1" signal is applied to the input side of the shift register 302 at a certain channel time, the address A1 of the detune memory 301 is specified, and after that, as the channel time passes, the signals from the 1st to 15th stages of the shift register 302 are When "1" signals are sequentially output, addresses A2 to A16 of the memory 301 are sequentially designated. As a result, from the detune memory 301, each channel time ch・t1 ~
Frequency correction numbers Fd having different values are read out in ch.t16.

The frequency correction number Fd time-divisionally outputted from the detune memory 301 is supplied to an adder 303, where it is added to the frequency number F of the regular pitch. As a result, the adder 303 outputs a modified frequency number F' (=F+Fd) obtained by changing the regular pitch frequency number F by "Fd".

In this case, the frequency correction number Fd is either a positive or negative value. Therefore, the modified frequency number F' changes within a range of ±Fd from the value representing the normal pitch.

This modified frequency number F′ is the accumulator 3
04, where the clock pulse φ
Accordingly, it is accumulated for each sound generation channel ch1 to ch16. That is, when the change frequency number F' of each sound generation channel ch1 to ch16 is inputted from the adder 303, the accumulator 304 changes the number F' for each channel at a cycle that is 16 times the clock pulse φ.
In other words, the channel time ch・t1~ch・t16 is accumulated every time it goes around, and each sound channel ch1~ch16
The cumulative value qF' (q=1, 2,...) of the repetition period corresponding to the frequency of the musical tone to be produced is formed, and this cumulative value qF' is used as phase information that specifies the phase of one period of the musical sound waveform. Time division output. This phase information
qF' is supplied to tone generator 305.
Note that the accumulator 304 is constituted by a cyclic addition type circuit including, for example, a shift register having 16 stages of storage positions and an adder.

The tone generator 305 outputs each sound generation channel from the accumulator 304 in a time-division manner.
Based on the phase information qF' of ch1 to ch16, the pitch musical tone signal corresponding to the information qF' is transmitted to each sound channel.
The musical tone signals of channels ch1 to ch16 are formed in a time-division manner, and after the musical tone signals are subjected to opening/closing envelope control using the key-on signal KON outputted from the key assigner 20, the musical tone signals of channels ch1 to ch16 are synthesized and output. This tone generator 305
The system is composed of circuits that utilize tone forming methods such as a waveform memory readout method, a harmonic synthesis method, a frequency modulation method, and an amplitude modulation method.

Each pronunciation channel formed in this way
The musical sound signals of ch1 to ch16 are supplied to the sound system 40 via sound generation control switches SWA, SWB, and SWC for each series, and are produced as musical sounds.

By the way, if we pay attention to the input of the shift register 302 in each musical tone generator 30A, 30B, 30C for reading the detune memory 301,
In the device 30A, the synchronization signal SYNC is input, in the device 30B, the output signal of the fifth stage of the shift register 302 of the device 30A is input, and in the device 30C, the output signal of the fifth stage of the shift register 302 of the device 30B is input. is entered.

Therefore, detune memory 301 of device 30A
is each channel time as shown in Figure 2b.
Address in ch・t1 to ch・t16 (Figure 2 a)
A1 to A16 will be designated respectively, and the detune memory 301 of the device 30B will be used for each channel time ch, t1 to ch, as shown in FIG. 2c.
At t16, addresses A12 to A16 and A1 to A11 are respectively designated, and furthermore, the device 30C
In the detune memory 301, addresses A7 to A16 and A1 to A6 are designated at each channel time ch.t1 to ch.t16, respectively, as shown in FIG. 2c.

In this way, each channel time ch・t1～ch・
The read address of each detune memory 301 at t16 is the read address of each musical tone generator 30A, 30B, 30.
Each detune memory 301 outputs frequency correction numbers in different phases (shifted by a predetermined amount) to each device 30A, 30B, and 30C in synchronization with each channel time ch.t1 to ch.t16.
Fd will be output sequentially.

Therefore, the frequency correction number Fd stored in each address A1 to A16 of the detune memory 301 of each series 30A, 30B, 30C is made different for each address as shown in FIG. If Fd is made common to each series,
For example, at channel time ch.t6, the frequency correction number Fd stored in the memory address "A6" is read out from the memory 301 in the device 30A as shown by the solid line A in FIG. From there, the frequency correction number Fd stored in the memory address "A1" is read out as shown by the broken line B in FIG. 3B. Also, the third
The frequency correction number Fd stored at the memory address "A12" is read out as shown by the dashed line C in FIG. In this case, each series 30A, 30B, 30
The same frequency number F is read out from the frequency number memory 300 of C.

Therefore, in the adders 303 of each series 30A, 30B, and 30C, the same frequency number F that defines the normal pitch of the pressed key is input for each series, but the frequency correction number Fd for shifting the pitch is input. A different value is input for each series.
As a result, the modified frequency number F' output from the adder 303 becomes different for each series. As a result, in each series 30A, 30B, and 30C, a musical tone signal corresponding to the pressed key is formed using different parameters for each series.

As a result, even if a plurality of musical tone generators are provided, different key-on random pitch effects can be obtained for each sound generation channel and for each series.

Note that the means for making the phase of the read address of each detune memory 301 different for each series is not limited to the structure using the shift register 302 as in the above embodiment, but other structures may be used.

Further, in the above embodiment, the pitch of musical tones is controlled in different manners for each sound generation channel and for each series, but musical tone elements such as timbre and volume may also be controlled.

As described above, the electronic musical instrument according to the present invention includes a plurality of series of musical tone generators each having a plurality of sound generation channels, and generates tone control parameters for each series when performing different musical tone control for each sound generation channel and for each series. Since the circuits can have the same configuration, the musical tone generators of each series can be made common, making it suitable for mass production, and furthermore, the adjustment work is simplified.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of an electronic musical instrument according to the present invention, FIG. 2 is a diagram showing the time relationship of frequency correction number generation channel times in the embodiment, and FIG. 3 is a diagram showing musical tones of each series in the embodiment. It is a figure which shows an example of the frequency correction number used by a generator. 10... Key switch circuit, 20... Key assigner, 30A, 30B, 30C... Musical tone generator, 40... Sound system, 300... Frequency number memory, 301... Detune memory,
302...Shift register.

Claims (1)

[Scope of Claims] 1. A plurality of systems of musical tone generating means having the same configuration each having a sound generation channel for generating N musical tones, and generating a musical tone corresponding to a pressed key under predetermined conditions for the sound generation channels. Accordingly, the present invention includes an assignment means for time-divisionally outputting key information indicating the key assigned to each sound generation channel in synchronization with the channel time corresponding to each sound generation channel, and supplying the key information to each of the above-mentioned musical tone generation means in parallel. In the electronic musical instrument, each of the musical tone generating means is provided with a parameter generating means having the same configuration that can sequentially generate N pieces of musical tone control parameter data in synchronization with each of the channel times, and each of the parameter generating means Each of the parameter generating means is configured to sequentially generate N parameter data shifted by a predetermined amount so that the parameter data generated simultaneously from the musical tone generating means is different for each of the musical tone generating means, and each of the musical tones An electronic musical instrument characterized in that each sounding channel of the generating means generates a musical tone based on the key information and parameter data regarding its own channel time. 2. Each of the parameter generating means is composed of a memory storing the N parameter data, and the readout address of each memory is shifted by a predetermined address for each musical tone generating means in synchronization with the channel time. An electronic musical instrument according to claim 1, which is configured to advance sequentially. 3. The electronic musical instrument according to claim 1 or 2, wherein the parameter data is data for changing the pitch, timbre, or volume of musical tones.